BASIC HURRICANE FACTS﻿

A tropical cyclone is a general term for an intense low-pressure weather system that forms over and is fueled by tropical ocean waters. In the North Atlantic Ocean and Eastern Pacific Ocean, strong tropical cyclones are called HURRICANES, but they have other names in other ocean regions. The beginning of life for any hurricane is a pre-existing disturbance in the atmosphere that requires certain atmospheric and oceanic conditions to develop into a hurricane. Mature hurricanes are nearly circular in shape and are typically a few hundred miles in diameter.

Destructive forces of hurricanes are threefold: wind,rain, and storm surge.

The most powerful and destructive threat to coastal areas is from storm surge.

(hurricanescience.org)

Credit: NASA

STORM SURGE

Credit: http://www.nhc.noaa.gov/surge/ssu.php

STORM SURGE is an abnormal rise in water level that is caused by two factors:

Inverted-barometer effect: pressure allows a dome of water to rise

Winds

Surge is also driven by the forward speed of the storm and it may arrive ahead of the storm itself. Surges can last between six to 12 hours in durations depending on the speed of the storm. The actual water level experienced at the coast will be a combination of storm surge and the normal tide cycle, known as the ﻿STORM TIDE﻿plus wind-driven waves. US Federal Agencies predict storm surge using a numerical computer model known as SLOSH.